Curb your cravings and control hunger for up to 4 hours with Slim Fast Advanced Nutrition Ready-to-Drink Slim Cafe Shakes. With as much caffeine as a cup of coffee and only 1g of sugar, this delectable low carb, high protein shake offers that little extra energy needed to take charge of your day. Slim Fast Advanced Nutrition Ready-to-Drink Slim Cafe Shakes are a great meal replacement with 20g of protein, 5g of fiber, and only 1g of sugar.